Method of making and impregnating paper-wrapped wire



March 31, 1931. N. c. LAMONT METHOD OF MAKING AND IMPREGNATING PAPER WRAPPED WIRE Filed Jan. 7, 1929 2 Sheets-Sheet l FIG. 2.

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METHOD OF MAKING AND IMPREGNATING PAPER WRAPPED WIRE Filed Jan. 7, 1929 2 Sheets-Sheet 2 FIG.7.

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Patented Mar. 31,. 1931 'UNIETED STATES waste PATENT OFFICE NEIL C. LAMON '1, OF EDGEWORTH, PENNSYLVANIA, ASSIGNOR TO NATIONAL ELECTRIC PRODUCTS CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE METHOD OF MAKING AND IMPREGNATING PAPER-WRAPPED WIRE Application filed January 7, 1929. Serial No. 330,925.

This invention relates to improved methods I of making wire and in more particular, to improved methods for moisture proofing paper wrappings which are provided upon such wire.

Heretofore, in the making of wire of the type shown in the patent to O. A. Frederickson, No. 1,687,013, it was the practice to cover the pair of Vari-colored insulated wires with 1Q a paper wrapping which consisted of convolutions of compacted, crinkled paper. Such paper was wrapped upon the wire in a dry state and after wrapping the wrapped wire was passed through a bath of hot wax in 1a order to obtain desired moisture proof characteristics for the paper wrapping.

With such a practice, it was necessary to leave the wrapped wire in the hot wax bath for a considerable time period in order to ef- 1 2c feet a thorough impregnation of the tightly compacted paper wrapping. Accordingly, diiiiculty was experienced because the heat of the saturating wax was suflicient to cause the identifying coloring of the individual dis- ZEi tinctively colored insulated wires to run together. One wire might have a black waxy covering and the other a white waxy covering and after impregnating the paper wrappings the identification of these wires would be difficult if not impossible on account of this running together of the colors of the insulation.

The present invention has for itsobject the provision of a new method of impregnating the paper wrappings for a wire of this character to the general end that the previous difficulties may be overcome and to the further end that a better impregnation of the paper wrapping may be obtained.

Further and other objects of the invention will hereinafter appear in the accompanying specification and claims and be shown in the drawings, -which by way'of illustration show what I now consider to be preferred instrumentalities for carrying "out the improved method.

Figure 1 is a view of the machine which is adaptable for carrying out the impregnating paper with .wax;

Fig. 2 is an elevational view of a wrapping machine;

Fig. 31s an enlarged sectional view of a part of the wrapping machine showing the die for ironing down the paper wrapping upon the wire;

. Figs. 4 and 5 are detail views of the die which ,is used in the wrapping machine;

Fig. 6 is a detail view of the saturating machine which is used for applying the finishing wax coat; and

Fig. 7 is a detail partly broken away View 7 of the wire which is produced.

In the making up of a paper wrapped wire the paper wrapping is first slit and rolled up upon disc or reels of the proper size to fit the wrapping machine. In lieu of wrapping the paper upon the wire and impregnating with wax after wrapping as has heretofore been the practice, the paper is impregnated previous to wrapping upon the wire by submerging the discs in a bath of hot wax and keeping them in such bath for a certain time period. One manner in which such impregnation of the discs may be carried out is shown in Fig. 1 of the drawings. Here the discs 10 are shown as hooked upon a travelling chain 11, which carries the discs individually down into and traverses them through a tank or bath of hot wax 12. This wax may be kept at the desired temperaturetby suitable heating means and the heating means may employ thermostatic controls if desired.

Preferably the hot wax is parafiine and it is maintained at a temperature of substantially 160 degrees F. Discs are kept in this bath of hot parafline for a time period which approxi ates two minutes. In practice it has been'f und that this time is sufficient to obtain a thorough saturation and impregnation of the paper of the discs. Saturation and impregnation proceeds from the edges of the paper and inasmuch as the discs are comparatively narrow the saturation can be quite thorough in this period of time. The molten wax readily penetrates in between the adj acent convolutions of the rolled strip of paper and such wax penetrates inward from both sides of the disc thereby affording the necessary saturation.

- strips are by the operation of the machine,

wrapped upon the wires 13. By the operation of thewrapping machine the insulated wires and the coils of crumpled paper are drawn through the constricted portion of a die 32 which serves to iron down the crumpled and compacted paper upon the insulated conductors 13. The wrapping machine herein described substantially requires no further description and per se forms the subject matter of a different application.

After the conductors 13 have been thus wrapped with paper and the wrapping ironed down, the wrapped wire is taken to another machine as shown in Fig. 6 of the drawings and is here drawn through a bath of hot wax 20 at high speed. The speed of this outside waxing operation is such that the heat of the wax bath does not have time to affect the inside identified wires one of which may be black and the other of which may be white.

The time of submergence provides, however, for a finishing coat of wax and for a thorough consolidation and impregnation of the paper coverings 17. The heat of the wax is sulficient to re-melt thewax which is in the interstices of the paper strips and in this way a thoroughly impregnated and consolidated wrapp ng is provided.

Fig. 7 shows the final conductor comprising the inner insulated wires 13, one of which may be white and the other of which may be black having therearound an impregnated paper wrapping 17a which ,is' further covered by a final wax coat 20a.

What I claim is:

1. The method of providing a waxed paper covering for wire which comprises impregnatmg the paper with wax prior to the applicat on of the paper to the wire, thereafter applylng the paper to the wire and wrapping the same therearound and in subsequently passing the wrapped wire through molten wax for the purpose described.

2. The method of making a'paper wrapped insulated wire which comprises, first impregnating the paper when the same is in rolled form w th wax, thereafter unrolling the impregnating paper and wrapping the same upon the wire, and in subsequently passing the wrapped wire through molten wax.

3. The method of making paper wrapped wire having multiple vari-colored insulated conductors therein and preventing the running of the color of the insulation whichnating the paper which is to constitute the wrapping with wax by passing narrow rolls of the paper wrapping through molten wax which is maintained at a temperature of substantially 160 degrees F. and in continuing the impregnation until the wax has permeated the paper and thereafter wrapping the paper upon the wire and subsequently rapidly passing the wrapped wire through another bath of molten wax.

.5. The method of impregnating a paper wrapping which is to be applied to a wire which comprises the-step of providing impregnation of the paper previous to its application to the wire by submergingrolls of paper wrapping in. a bath of molten wax and in effecting impregnation of the individual convolutions of paper by permeation of the waxes from the edges of the paper and in maintaining the roll of paper with its convolutions of paper in a maintained wrapped relation to each other at all times when the roll is in .the bath to thereby prevent direct surface contact of thewax with the paper of the inner convolutions, which surface contact if not prevented would apply excessive quantities of wax to the paper to be impregnated.

6.The method of impregnatinga paper wrapping for wire which comprises submerging a roll of the aper wrapping in'a bath of molten wax and in maintaining said roll in the wax until thorough impregnation of the convolutions of paper has been effected b the wax permeating the roll from the edges and in maintaining the roll of paper with its convolutions of paper in a maintained wrapped relation to each other at all times when the roll is in the bath to thereby prevent direct surface contact of the wax with the paper of the inner convolutions, which surface contact if not prevented would apply excessive quantities of wax to the paper to be impregnated.

7. The method of making a paper wrapped ping to multiple varied colored insulated wires and in impregnating the paper while preventing runmng to ether of the coloring of the insulzition whic compriseshfirst impregnating t e paper. wrapping w ich is to 5 be subsequentliy applied with wax, thereafter wrapping sai impregnated pa er upon the insulated wires, and in therea ter applying further wax to the outer surface of the wrapped wire by passing the wire through molten wax andin coordinating the time of such last mentioned wax application to provide for the consolidation of the previous impregnated wrappings while preventing excessive heating of the interior insulation, which would cause running together of the coloring matter of such insulation. In testimony whereof I hereto afiix my signature.

NEIL c. LAMONT. 

